import { addResizeListener, removeResizeListener } from 'element-ui/src/utils/resize-event'
// 设置表格高度
const doResize = async(el, binding, vnode) => {
    // 获取表格Dom对象
    const { componentInstance: $table } = await vnode
    // 获取调用传递过来的数据 
    const { value } = binding
    if (!$table.height) throw new Error(`el-$table must set the height. Such as height='100px'`)
    // 获取距底部距离（用于展示页码等信息）
    const bottomOffset = (value && value.bottomOffset) || 30
    if (!$table) return
    // 计算列表高度并设置
    const height = window.innerHeight - el.getBoundingClientRect().top - bottomOffset
    $table.layout.setHeight(height)
    $table.doLayout()
}

export default {
    // 初始化设置
    bind(el, binding, vnode) {
        // 设置resize监听方法
        el.resizeListener = async() => {
            await doResize(el, binding, vnode)
        }
        // 绑定监听方法到addResizeListener
        addResizeListener(window.document.body, el.resizeListener)
        addResizeListener(el, el.resizeListener)
    },
    // 绑定默认高度
    async inserted(el, binding, vnode) {
        await doResize(el, binding, vnode)
    },
    // 销毁时设置
    unbind(el) {
        // 移除resize监听
        removeResizeListener(el, el.resizeListener)
    }
}
